it was randi who navigated away from mark, jus hours after she organized presint obama' visit to facebook's headquarters. >> myame is barack obamand i'm the guy that got mark to wear tie. >> reporter: president oba in town, that was huge thing, especially arod here. the town ha that you hosted and then you walked up, you walked home, youumped into mark at hom and how did it go from tre? >> we lived ithe same neighborhood. that i felt le i was ready to leave. you say something and you g oh, words, go back in. it had clrly been iny mind experience i had at facebook, i'm so grateful for my brother for includinge in that amazing journey, but also really important for me to make a name for myself that's certainly you'll read in my bk a t, mywn struggles with loving facebook b not wanting to always b mark zuckerberg's ster. >> your mo's a pchiatrist so it mark's big ster or -- but is >> is viously opened up a lot of doors for me, a lot of oppounity. but onehing you have to know about ma zuckerberg, you go into that house and all four of her kids are equal. created a multi-billion doll great apple